3. The attempt at a solution
I think the FNET equation is Fsp=ma and I'm pretty sure you have to solve for [tex]\tau[/tex] but in order to do that I need to solve for a. How do I either find a velocity or acceleration to do this?

What kind of proportion? If (as you say) it takes 1.5 seconds to make one revolution, then it will make two revolutions in 3 seconds. But you are told that it makes 1.5 revolutions in one minute or 60 seconds. So what you say can't be right. Look at it this way: it makes 1.5 revolutions in 60 seconds. Can you find how many seconds for one revolution? It must be greater than 30 and less than 60.